<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script src="https://unpkg.com/vue@next"></script>
<div id="app">
    <todo-item></todo-item>
</div>
<script>
    const app = Vue.createApp({})

    app.component('todo-item', {
        template: `<div>哈哈哈</div>`
    });

    app.mount('#app');
</script>
</body>
</html>
